As it emerged that some athletes could appear barefoot on the podium at London
Games, we look at past Olympic controversies.

Linford Christie wore Puma contact lenses at a press conference before the Atlanta Olympic Games 100m final. Reebok was the official sponsor.

Mark Foster was kicked out of the Sydney Olympic village by officials after waring a Speedo branded swimsuit in the 50m freestyle final rather than the BOA approved suit.

At the 1992 Barcelona Olympics Nike sponsored the US basketball team in spite of Reebok being the official sponsor. During the ceremonies the players covered up their Reebok logos.

The French women's football team, sponsored by Nike qualified for the London Olympics but they faced a contractual fine of 10 mill euros if they endorsed any competitor, such as the Games sponsor adidas in any way. They have withdrawn

Adidas was the official sponsor of the 2002 Boston marathon, but Nike spray-painted runners with Nike swooshes as they left the course.